Speclinecanon 3.1.0HandbookReferenceDocsFor agents ↗
Specline · canon 3.1.0

Specs your agents
can build from.

Specline is a methodology for defining product work as specs that live in your codebase — every feature in one consistent shape, so an AI agent knows exactly what to build, what's out of scope, when it's done, and who decides.

It exists because the usual way fails. Hand an agent a feature and it builds what you said, then confidently invents the parts you didn't — and you find out at review. A plan in a task tracker, apart from the code, can't constrain that. Specline moves the spec into the repo, where it can.

Start with the problem →For your agents ↗

Three ways in

Learn it, look it up, or run it.

Learn it — the handbook →
The argument, start to finish: the problem, the bet, and how the methodology works. Read this first.
Look it up — reference →
The operational detail: folders, frontmatter fields, specline.yml, the lifecycle, the boundaries.
Run it — get started →
Install the tooling and point an agent at your repo: shape a spec, check it, build from it.

Also: the canon (the full methodology as raw markdown, for agents) ·the honest pitch (every claim, with how it breaks) ·why now (why this helps more as models get stronger).